Projection image display device having two modulation stages, including one aperture modulation stage
US8231228B2 · kind B2 · utility
3Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2007 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Jan 8, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/315
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for illuminating the surface of an object by using a source beam is provided. The source beam is partitioned into as many illumination sub-beams as there are surface elements to be illuminated, and their aperture is modulated as a function of the predetermined luminous intensity to be assigned to the surface element. Each surface element is illuminated with the aid of one of said illumination sub-beams. Used for illuminating the imagers of projection devices, this method makes it possible to add a second modulation stage allowing the display contrast of the images to be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.